Design of anchorages

The design of anchorages is covered by Section 8 of Eurocode 7 Part 1, 'Anchorages', whose contents are as follows: §8.1 General (12 paragraphs) §8.2 Limit states (1) §8.3 Design situations and actions (2) §8.4 Design and construction considerations (15) §8.5 Ultimate limit state design (10) §8.6 Serviceability limit state design (6) §8.7 Suitability tests (4) §8.8 Acceptance tests (3) §8.9 Supervision and monitoring (1)

Section 8 of EN 1997-1 applies to prestressed and non-prestressed anchorages (both temporary and permanent), used to support retaining structures, to stabilize slopes, cuts, and tunnels, and to resist uplift of structures. Section 8 does not apply to tension piles used to anchor structures.

An anchor is a structure consisting of a tendon free length (designed to satisfy overall structural stability) and a restraint (designed to transmit tensile forces to the surrounding ground). In prestressed anchorages, the restraint is provided by a tendon bond length bonded to the ground by grout; in non-prestressed anchorages, the restraint is provided by a deadman anchorage, a screw anchor, or a rock bolt.

An anchorage is a structure consisting of an anchor head and an anchor. The anchor head (typically, a nut, flat washer, plate, stud, or bolt head) transmits restraining forces to the structure.

The Principles and Application Rules given in §8 are written with grouted anchorages in mind - deadman anchorages, screw anchors, and rock bolts are given scant attention. EN 1997-1 explicitly states that §8 does not cover the design of soil nails.

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